Boil a kettle of water. melt chips in microwave per package directions.

Beat cheeses with electric mixer on medium speed. Add sugar, cocoa, vanilla, and salt. Beat until fluffy. Add eggs, one at a time. Beat in chocolate.

Pour over crust. Set in roasting pan, place in oven, and pour in boiling water to reach halfway up sides of cheesecake pan. Bake until center is almost set but still a bit jiggly, about 40 minutes. (Cheesecake will firm as it cools.)

Crack oven door open with handle of wooden spoon. Leave cake in turned-off oven 1 hour. Remove from oven, take cake from water, and cool. remove foil. Run knife around edge of cake and chill at least 8 hours.

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